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condensing boiler

Condensing boilers are water heaters fueled by gas or oil. They achieve high efficiency (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted. This condensed vapour leaves the system in liquid form, via a drain. In many countries, the use of condensing boilers is compulsory or encouraged with financial incentives.

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  1. S

    condensing boiler in the loft

    just was with customer to talk about there options of boiler change ,boiler is in the loft and that is where they want the new combi ,just thinking of the condens pipe ,is it best to run it to the soil stack or ......??? loft is use as storage only! gas 22mm ,and 25 mdpe already there...
  2. C

    Volkera Condensing Boiler - froze, thawed, now not working

    My boiler a Mynute HE stopped worknig last night. We were told be a friend of a friend to defrost the condensing pipe - which we found was frozen solid. Since we defrosted the pipe, the boiler can now run and heat the radiators and water, but it cuts out when it reaches about 67 deg C, and...
    • coldinyorkshire
    • Thread
    • boiler condensing condensing boiler not working oil working
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  3. H

    I have a C28 Heatline condensing boiler with the Overheat Safety Thermostat?

    I have a C28 Heatline condensing boiler with the Overheat Safety Thermostat light flashing red. It says to check and replace and i have replaced it but still the red light is flashing so no heat or hot water. PLEASE HELP!
    • hassom
    • Thread
    • boiler condensing condensing boiler heatline oil overheat safety thermostat
    • Replies: 15
    • Forum: Plumbing Jobs | The Job-board
  4. G

    glowworm condensing boiler roars

    i have a glowworm 30hxi which is 1yr old, in the past few weeks it as started to make a roaring noise, it doesnt do it all the time but now and again, i have been next to the boiler when it does it, it will be getting up to max temp on the boiler when it will roar and the temp will rise...
  5. M

    leaking problem with greenstar 24i condensing boiler

    hi i need some advice i have a 24i greenstar boiler its only about 3 years old .Just recently i noticed that when i turn on the c / heating the boiler fires up ok but after about 10 minutes or so i starts to leak from the base of the boiler,im talking about the large chrome looking unit that...
    • mardey
    • Thread
    • 24i bar boiler central heating system condensing condensing boiler greenstar hot hot water leak leaking noise oil pipes pressure problem reset shower system tap waste water water pressure work
    • Replies: 11
    • Forum: Plumbing Jobs | The Job-board
  6. P

    condensing boiler pressure

    I have a Vailant condensing boiler (fitted last year) and have a query re the pressure. When running (it turns on off a thermostat) the pressure reads approx 1.2-1.3 bar. When not running it is around 0.7-0.9 bar. Obviously I can put more water in to increase the pressure but would like to...
    • plumbinguser
    • Thread
    • air bar bleed bleeding boiler cold cold weather condensing condensing boiler high low pressure oil pressure radiators system water weather work
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  7. R

    Baxi condensing boiler problem.

    Can anyone help? My boiler just made a loud banging noise (could have been air in the system) and the pipework around the boiler area started knocking then the boiler shut down! Since then as soon as the temperature falls below the TRV setting the boiler starts up as usual and the same thing...
    • rob588
    • Thread
    • air airlock banging baxi boiler burner condensing condensing boiler noise oil problem safe safety system temperature trv
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  8. K

    Which system condensing boiler is best for a long horizontal flue?

    I am having my boiler replaced and have a long (c 7 meter) horizontal flue. My preference would be a Worcester Bosch 30cdi but one plumber told me I need a Keston due to the long flue (he normally works with Worcester Bosch's and Vaillants). I've read horrible reviews of Kestons. Anyone have...
    • katalin
    • Thread
    • baxi boiler boilers bosch central heating system condensing condensing boiler corgi eco flexible flue horizontal installation installers mynute oil plumber system vaillant vokera which worcester work
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  9. M

    Condensing Boiler not commissioned

    I had a new condensing boiler fitted last March. At the same time I was refurbishing my house and when the plumber had finished fitting the boiler he said he couldn't complete the commissioning as he needed to do a check where he needed to run the bath tap as that provided the best flow rate...
    • MickBrown
    • Thread
    • bath boiler condensing condensing boiler fitting fix flow gas gas safe job oil pipe plumber pressure safe tap wall
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  10. C

    outside condensing boiler hesitant to start.

    Hello, i would appreciate a bit of advice with a new outside condensing boiler i recently installed. It's an open vented 26kw model with a firebird burner. The damn thing will run for a week and then refuse to start. I noticed from the beginning that it would hesitate nearly every time before...
    • crackingup9
    • Thread
    • air boiler boilers burner combi combination condensing condensing boiler connections high install leak oil open vented outside plumber pressure problem pump school start test
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  11. D

    condensing boiler servicing

    Hi Guys just interested in how many of you out there are removing and cleaning the burners on the newer combi condensing boilers. the FGA test showed a ratio of 0.0007 which is well within spec on a 2 year old Vokera 28 HE the gas rate and burner pressures were all ok so does it merit the...
    • derrybongo
    • Thread
    • advertising baxi boiler boilers burner cleaning combi condensate condensing condensing boiler drain flame gas head newbie oil power pressure remove service servicing test waste water
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  12. N

    positioning the flue to condensing boiler

    can anyone please tell me if I can fit/extend the flue to a condensing boiler that is about 3 inches below the eaves so it terminates beyond the fascia board and gutter, thanks in advance
    • nigelP
    • Thread
    • appliance boiler condensing condensing boiler corgi fitting flue gas gas safe inside install job magnaclean metal oil pipes power safe seal sealed soil supply vaillant vent water work
    • Replies: 16
    • Forum: Plumbing Jobs | The Job-board
  13. J

    Warmflow condensing boiler water pressure loss.

    Hello everyone, I'm new to the forum... and would appreciate a little help? I have a water pressure leak in my boiler warmflow "90 HE pumped". It is just over a year old. I changed out the expansion vessel - pin hole leak in the bladder... the system held pressure for 2 days (2.5 bar) 25 deg...
    • JimH
    • Thread
    • bar boiler boilers cold condensing condensing boiler expansion expansion vessel hose hot hot water leak loft oil pipe pressure pressure loss problem radiator radiators secondary system tank telford temperature vessel warmflow water water pressure
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  14. P

    Banging Condensing Boiler

    Hi all, We have a problem. Our 3 yr old Ferroli Optimax 25c condensing combination bolier has started to make banging noises within the last 48 hours. It is wall mounted in the loft with the condensate outlet connection leading to the outside gutter. The boiler has always worked great up until...
    • pepsicola
    • Thread
    • banging boiler central heating system combi combination condensate condensing condensing boiler difficult ferroli loft oil optimax pipe problem trap wall waste water
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  15. S

    Condensing Boiler

    I am planning on using a condensing boiler (not combi) in a new installation (no previous CH in an old building) would the new boiler be a sealed system fed by a filling loop directly from the main or would it utilise an F & E tank.(not connecting any gas !)
    • steven wheaton
    • Thread
    • boiler building combi combi boiler condensing condensing boiler cylinder efficiency filling loop gas hot hot water hot water cylinder install installation oil regulations sealed supply system tank water
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  16. S

    Electrical Wiring to Awkward Condensing Boiler

    Hi folks, hope someone can help us here, I'm struggling to get my head around a complicated electrical install of boiler & cylinders. I'm an electrician, not a plumber. The new system has been installed by others but we've been called in to 'sort it out' after the previous people gave up...
    • superstardeejay
    • Thread
    • boiler boilers central heating system circulation condensing condensing boiler cylinder dhw difficult electrical fitting free head hot hot water inside installation motorised valve oil overheat power pump radiators switch timer valve valves water wiring
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  17. G

    glow worm condensing boiler energy saver 40

    i have a condensing boiler, glow worm energy saver 40. The demand light will not come on unless i turn the water temp to 0. I bought a pcb today for 77 pounds, the one that contains the stat neon light etc. This made no difference. I have tried a replacement fuse on the pcb which also made no...
    • gaz2527
    • Thread
    • boiler condensing condensing boiler energy fix glow glow worm glow-worm oil problem replacement water worm
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  18. M

    Condensing Boiler Issues - any advice?

    Our Worcester Greenstar 24i boiler (installed '05) stopped working late Thursday 1st Jan. When restarted it made the most horrendous sloshing/gurgling/clanking sounds. Worcester support line engaged for ages, British Gas couldn’t come out ‘til Monday. Managed to get a local plumber to come out...
    • MrsE
    • Thread
    • 24i advice boiler condensate condensate pipe condensing condensing boiler drain gas hot hot water issues local plumber oil pipe plumber power pump switch water worcester
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  19. D

    Reliable condensing boiler

    i have fully pumped, twive valve system with a cold water tank in the loft and cylinder in my bathroom. Im trying to research into a reliable condensing boiler. I feel my potterton 100e maybe reaching the end of its lifecycle is been a pain in the arse and i want to replace with a reliable...
    • discostewart
    • Thread
    • bathroom baxi boiler central heating system cold cold water cold water tank condensing condensing boiler cylinder gas hot hot water install loft oil potterton problem reliable sime system tank technology valve water winter
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  20. H

    Separate pump in addition to the one included in the condensing boiler?

    My main question is whether I need a separate pump in addition to the pump within the condensing boiler. I am replacing a boiler. The previous boiler was the old open flue type and had two external pumps. The new boiler is a Vaillant EcoTec 630 plus system boiler. The boiler together with...
    • hughs
    • Thread
    • boiler central central heating system cold condensate condensing condensing boiler cylinder eco hot hot water hot water system included oil pipe pipes pump radiators secondary separate shower pump showers system tank vaillant wall water
    • Replies: 11
    • Forum: Plumbing Jobs | The Job-board

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